.parent{
    width: 500px;
    background-color: orange;
    padding: 5px;
}
.child{
    width: 100%;
    background-color: skyblue;
    padding: 5px;
}
.grand{
    width: 100%;
    background-color: grey;
    padding: 5px;
}
.grand-child{
    width: 100%;
    background-color: green;
    padding: 5px;
}